COSL is one of the leading integrated oilfield services providers in the word with over 50 years of experience in offshore operation covering each phase of offshore oil and gas exploration, development and production. COSL is listed on both ShangHai and the HK Stock Exchange. With its four core business segments of geophysical and surveying services, COSL not only provides services of single operations for customers, but also offers integrated package and turn-key services. COSL business activities are conducted in China, Asia-pacific, Middle East, American, Europe and Far-East, covering more than 30 countries and regions in the word.

Oil wells drilling. Natural gas wells drilling. Services related to oil extraction except survey. Services related to natural gas extraction except survey.